U.S. patent number 3,801,278 [Application Number 05/234,020] was granted by the patent office on 1974-04-02 for sterilizing apparatus for hydrophilic contact lenses.
This patent grant is currently assigned to Sybron Corporation. Invention is credited to Darrlle D. Moore, Hubert Wagner.
United States Patent |
3,801,278 |
Wagner , et al. |
April 2, 1974 |
STERILIZING APPARATUS FOR HYDROPHILIC CONTACT LENSES
Abstract
Apparatus for sterilizing hydrophilic contact lenses. In the
apparatus housing are two compartments, one compartment for
sterilizing sealed vials filled with a saline solution and the
contact lenses, and another compartment for maintaining squeeze
bottles of the saline solution at an asepticizing temperature. Each
compartment has its own heating element and thermostat control with
the overall cycle of operation of both compartments being
controlled by a single timer.
Inventors: |
Wagner; Hubert (Dubuque,
IA), Moore; Darrlle D. (Dubuque, IA) |
Assignee: |
Sybron Corporation (Rochester,
NY)
|
Family
ID: |
22879543 |
Appl.
No.: |
05/234,020 |
Filed: |
March 13, 1972 |
Current U.S.
Class: |
422/116; 219/417;
219/430; 219/439; 219/478; 219/521; 422/300; 422/307 |
Current CPC
Class: |
A61L
12/04 (20130101) |
Current International
Class: |
A61L
12/00 (20060101); A61L 12/04 (20060101); A61l
003/00 (); A61l 007/00 (); F27d 011/00 () |
Field of
Search: |
;21/86,87,88,89,90,119,85,105
;219/282,415,416,417,418,419,476,477,478 ;206/5A ;351/160 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Wolk; Morris O.
Assistant Examiner: Turk; Arnold
Attorney, Agent or Firm: Roessel; Theodore B. Aceto;
Roger
Claims
Having thus described the invention in detail, what is claimed as
new is:
1. Hydrophilic contact lens sterilizing apparatus comprising:
a. a housing having a top opening to permit access into the
housing;
b. a first heater block member in said housing, said block having a
recess therein defining the bottom and sides of a compartment, said
block member including means for maintaining said block at a
sterilizing temperature above 100.degree. C.;
c. a second block member of heat conducting material in said
housing forming an asepticizer compartment including means for
maintaining said second block member at an asepticizing temperature
below said sterilizing temperature, said second block member being
adapted to receive containers of saline solution;
d. heat insulating means separating said first and second block
members;
e. a removable tray of heat conducting material adapted to rest in
said recess and receive heat from said first heater block member,
said tray being adapted to accomodate a plurality of sealed vials
containing saline solution and the hydrophilic contact lenses;
and
f. timer means controlling the cycle of operation of said means for
maintaining temperature of said block members.
2. Apparatus as set forth in claim 1, wherein said second block
member is provided with a plurality of wells for receiving said
containers of saline solution.
3. Apparatus as set forth in claim 1, wherein said removable tray
is sectioned into a plurality of compartments, each receiving one
of said vials.
4. Apparatus as set forth in claim 1, wherein said means for
maintaining the temperature of said block members include two
heating elements and two thermostats, one heating element and
thermostat being associated with each of said block members.
5. Apparatus as set forth in claim 4, wherein the heater element
and thermostat associated with said first heater block member
maintain the temperature thereof at about 124.degree. C. and the
heater element and thermostat associated with said second block
member maintain the temperature thereof at about 90.degree. C.
6. Apparatus as set forth in claim 4, wherein said timer means
controls the operation of both of said heating elements.
7. Apparatus as set forth in claim 6, wherein said two heater
elements and thermostats are in parallel circuits connected in
series with a switch, said switch being closed to deliver power to
said timer and parallel circuits and said timer operating to open
said switch after a timed cycle of operation.
8. Hydrophilic contact lens sterilizing apparatus comprising:
a. a housing having a top opening to permit access into the
interior of said housing;
b. heat insulating means dividing a portion of the interior of said
housing into two compartments, one a sterilizing compartment and
the other an asepticizer compartment;
c. a first block member of heat conducting material defining the
bottom of said sterilizer compartment;
d. a second block member of heat conducting material in said
asepticizer compartment, said block having a plurality of wells for
receiving therein containers of saline solution;
e. first heater means including a thermostat for maintaining the
temperature of said first block member above 100.degree. C.;
f. second heater means including a thermostat for maintaining said
second block member at an asepticizing temperature below
100.degree. C.
g. a single timer for controlling the cycle of operation of said
first and second heater means; and
h. a removable tray of heat conducting material adapted to rest on
and receive heat from said first block member, said tray being
adapted to accomodate a plurality of vials containing saline
solution and said hydrophilic contact lenses.
9. Apparatus as set forth in claim 8 wherein said block members are
in said housing spaced one from another, said insulating means
being an air space between said block members.
10. Apparatus as set forth in claim 8, wherein said first block
member has a recess therein adapted to receive said removable tray.
Description
BACKGROUND OF THE INVENTION
The present invention relates to apparatus for use by
ophthalmologists and the like, for sterilizing hydrophilic contact
lenses in bulk and for asepticizing containers of the saline
solution in which the lenses are sterilized.
Hydrophilic contact lenses are water absorbent, and therefore
require sterilization by heating in an aqueous saline solution
before being fitted to the patient's eye. In fitting a patient with
hydrophilic contact lenses, several lenses may be tried before a
proper fitting pair of lenses are found. For this reason, apparatus
for sterilizing lenses in bulk is required.
Heretofore sterilization of hydrophilic lenses has been
accomplished by sealing the lenses in vials containing a saline
solution and then placing the vials in a water bath. However, water
baths can only reach a temperature of 100.degree. C. which in all
cases might not be sufficient to ensure proper sterilization of the
lenses sealed in the vials.
It is also desirable for the physician to have on hand quantities
of aseptic saline solution for placing in these vials prior to
sterilizing. An aseptic solution is one which has been sterlized
and then held at a temperature high enough to inhibit regrowth of
bacteria.
In the present invention, apparatus is provided which permits bulk
sterilization at a temperature of approximately 124.degree. C. of
vials containing hydrophilic contact lenses, while at the same time
providing an asepticizing temperature of approximately 90.degree.
C. for containers of the saline solution.
SUMMARY OF THE PRESENT INVENTION
The present invention may be characterized in one aspect thereof,
by the provision of a housing having insulating means dividing the
housing into two compartments, a sterilizing compartment and an
asepticizer compartment. The sterilizing compartment is more
particularly formed by a first block member of heat conducting
material having a rectangular recess therein, the block being held
at a temperature of 124.degree. C. The asepticizer compartment is
formed by a second block member of heat conducting material held at
a temperature of 90.degree. C. Plastic squeeze bottles filled with
saline solution are placed in wells formed in the second block
member and sealed vials containing saline solution and the
hydrophilic contact lenses are placed in a removable tray which
rests within the recess of the first block member. Each compartment
in the housing has its own heating element and thermostat control
but a single timer controls the cycle of operation of both
compartments.
OBJECTS OF THE INVENTION
One object of the present invention is to provide a single unit
apparatus for simultaneously sterilizing bulk quantities of
hydrophilic contact lenses and asepticizing bulk quantities of
saline solutions.
Another object of the present invention is to provide a
sterilizer-asepticizer apparatus for hydrophilic contact lenses,
wherein sterilization of the lens takes place at a temperature of
approximately 124.degree. C.
A further object of the present invention is to provide apparatus
having one compartment for sterilizing hydrophilic contact lenses
and another compartment for asepticizing saline solution, wherein
the cycle of operation of both compartments is controlled by a
single timing apparatus.
These and other objects, advantages and characterizing features of
the present invention will become more apparent upon consideration
of the following detailed description thereof when taken in
connection with the accompanying drawings depicting the same.
DESCRIPTION OF THE DRAWINGS
FIG. 1 is a top perspective view of the present invention, showing
the sterilizer tray removed from the apparatus; and
FIG. 2 is a schematic of the electrical system of the
apparatus.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring to the drawings, FIG. 1 shows the apparatus generally
indicated at 10. The apparatus includes a housing 12 open at its
top 14, the open top being closed by any suitable closure such as a
hinged door or sliding cover 16. Within the housing are two block
members 18 and 20 of heat conducting material which are separated
by any suitable heat insulating means 22 such as an air gap or wall
of insulating material. Block member 18 forms the sterilizer
compartment and block 20 the asepticizer compartment in a manner
set out hereinbelow.
Block member 18 forming the sterilizing compartment is provided
with a rectangular recess 24. Designed to fit into this recess and
rest on the bottom 26 of the recess is a tray 28, made of any
suitable heat conducting material, such as aluminum. The tray is
designed to carry a plurality of vials 30, each vial containing the
hydrophilic contact lenses and saline solution. Tray 28 can simply
be an open tray. Preferably, however, the tray is formed with a
plurality of compartments 32, as shown, for holding individual
vials. In this respect the dimensional tolerances of these tray
compartments 32 should closely fit the vials to maximize the
interface areas and thus maximize the heat flow rate from the tray
to the vials. In the same respect, the tray should rest as flat as
possible on recess bottom 26 to maximize the heat flow rate from
the block member 18 to the tray.
Block member 20 forming the asepticizer compartment is provided
with a plurality of wells 34, each designed to receive a plastic
squeeze bottle 36 filled with the saline solution. The dimensional
tolerances of wells 34 should closely fit these squeeze bottles for
optimum heat flow from the block member to the bottles.
The front of housing 12 is provided with pilot lights 38 which
indicate when the various heating elements (to be described
hereinbelow) are operating. Also on the front of the housing is a
timer actuation push button 40 for starting the cycle of
operation.
Referring to FIG. 2, the schematic of the apparatus shows the
sterilizer and asepticizer sections 18 and 20 enclosed in dotted
lines. Each section has its own electric heating element, 42, 44,
and thermostat 46, 48 respectively. An appropriate fuse 50 may be
provided for each section to prevent the danger of over heating,
should the thermostat fail.
The schematic shows that the two heaters and their thermostats are
connected in a parallel circuit which is in turn connected in
series with a timer mechanism generally indicated at 52. Thus
electric power to both heaters 42 and 44 is controlled by this
timer mechanism. It should be appreciated that when push button 40
on the timer is pressed, a timer switch 54 is closed. Closing
switch 54 in turn delivers power to both the heating elements and
starts timer motor 56. At the end of the cycle, when motor 56 times
out, switch 54 is opened, cutting off the power to the heating
elements.
In operation, then, up to four 4 oz. squeeze bottles of saline
solution may be placed in wells 34. Tray 28 is then loaded with up
to 24 vials, and the tray lowered into recess 24 and onto the
bottom 26 of block member 18. Cover 16 is moved to close the
housing opening and the timer actuation button 40 pushed to
initiate the cycle.
Heating element 42 and its thermostat 46 in the sterilizer section
are pre-adjusted to insure a sterilization temperature of
approximately 124.degree. C. and to maintain this temperature level
for approximately 15 minutes. Heating element 44 and its thermostat
48 in the asepticizer section are adjusted to insure that a maximum
of 90.degree. C. is maintained in the section for approximately 10
minutes. The 15 minute sterilizing cycle at 124.degree. C. and the
10 minute asepticizing cycle at 90.degree. C. are all accomplished
within an overall 75 minute time cycle, as controlled by electric
timer 52. For example, if the start of the cycle is time 0 or T-0,
and the end of the cycle is 75 minutes later or T-75, it is well
within the art to proportion the wattage of heating elements 42 and
44, the mass of block members 18 and 20, and various other factors
so as to insure that vials 30 will reach the sterilizing
temperature of 124.degree. C. at or before T-60 and the plastic
squeeze bottles 36 filled with the saline solution will reach a
temperature of 90.degree.C at or before T-65 minutes. In such a
case, both the vials and squeeze bottles will be maintained at the
desired temperature for the desired length of time, that is 15 and
10 minutes respectively when the clock timer expires at T-75
minutes.
Thus it should be appreciated that the present invention
accomplishes its intended objects in providing in one unit the
facilities to both sterilize in bulk hydrophilic contact lenses and
to provide a quantity of aseptic saline solution in which the
lenses are placed for sterilization. The use of two separate
heating elements and thermostats ensures the proper temperature for
each compartment, with the cycle of operation in both compartments
being initiated and controlled by a single timing apparatus.
* * * * *